US PATENT SUBCLASS 409 / 243
BROACHING

Current as of: June, 1999
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409 /   HD   GEAR CUTTING, MILLING, OR PLANING

243BROACHING {20}
244  DF  .~> Process
245  DF  .~> With control means energized in response to activator stimulated by condition sensor {1}
247  DF  .~> With means to distribute cutter infeed force
248  DF  .~> With means to select cutter or to select or modify cutter drive
249  DF  .~> With means to clean, lubricate, or modify temperature of work or cutter
250  DF  .~> With product handling means {3}
254  DF  .~> With means to protect operative or machine (e.g., guard, safety device, etc.) {1}
256  DF  .~> With work immobilizer and means to activate work immobilizer interrelated with cutter infeed, work infeed, or work advance
257  DF  .~> With work infeed or advancing means and means to clamp the work thereto, which clamping means is interrelated with work or cutter infeed
258  DF  .~> Means to remove flash or burr
259  DF  .~> Means for cutting groove {1}
262  DF  .~> Orbital carrier for cutter
263  DF  .~> Orbital carrier for work
264  DF  .~> With means to cyclically manipulate cutter or cutter support {3}
268  DF  .~> With plural cutters
269  DF  .~> With means to advance, infeed, or manipulate work {2}
276  DF  .~> With means to hold work during cutting {3}
280  DF  .~> Cutter infeed means {1}
286  DF  .~> Machine frame
287  DF  .~> Cutter support or guide

DEFINITION

Classification: 409/243

BROACHING:

(under the class definition) Apparatus or method (1) employing a multitoothed cutting tool characterized in that: (a) the functional edges of the tool teeth are so related to one another that the tip of one tooth extends further than that of an adjacent tooth from a datum line interior to the tool and paralleling the path of relative movement of tool and work (which extent is measured along the normal to such datum line through the tip); and (b) the differences in such extent between adjacent teeth are progressive from tooth to tooth (or group of teeth to group of teeth) along such path of relative movement, resulting in a stair-step arrangement of teeth (or groups of teeth) along such path and relative to the datum line of reference; and (2) in whose operation or performance the teeth succesively engage the work in substantially overlying paths, each tooth removing a predetermined amount of material so that the work modification produced is congruent to the last acting tooth.

(1) Note. Illustrative broach tools are shown in the accompanying drawings. (See accompanying drawings below). [figure] [figure] [figure]

(2) Note. In the case of rotary tool motion, it will be noted that the normal to the datum line (referred to in the definition) is the radius extending through the tooth tip.

(3) Note. As indicated by the parenthetical material in part (1, b) of the above definition, the progressive extent of differences between the tips (or outer cutting edges) and the datum line is intended to include a tool comprising a plurality of groups or units of several teeth each, the tooth elements of each group having the same extent from the datum line and extending further therefrom than the tooth elements of the next preceding group, so as to form a stair-step arrangement of such groups.

(4) Note. A patent directed to a tool having a unit of tooth elements of uniform characteristic (such as described in (3) Note, above) but intended to perform another function (such as scraping or burnishing) will be found in the class relating to such other function(s).

(5) Note. Included in this specific subclass, as at least a cross-reference copy, will be a patent claiming significant machine frame structure. Patents of this character are generally directed to adjustability of frame means for convertibility of the machine from or to a vertical or horizontal operation or for a push or pull operation, or to frame structure adapted to accentuate accessibility to machine parts, or to means for transferring broaching tool thrust to the machine bed.

(6) Note. A patent wherein the work feed system imparts energy to the work support so as to absorb contemplated broach thrust will be found in subclass 269 below; an example of such will be a crank pin which positions a work table at the dead center position of such crank pin but wherein the drive force actuating the crank is above that necessary to obtain said dead center position. (7) Note. A single-edged cutter device for shaping work, though described as a broaching machine, is excluded from this and indented subclasses. Such devices are classified in Class 409, Gear Cutting, Milling, or Planing, subclasses 288+ (for which see (1) Note thereunder) and Class 83, Cutting, subclasses 875+.

(8) Note. A patent to apparatus for combined machining operations, including broaching, is generally found in Class 29, Metal Working, subclasses 33+, except in some instances where the combination is specifically provided for in the class schedule of the other (i.e., nonbroaching) machining operation.

SEE OR SEARCH CLASS

29, Metal Working,

90.01+, for a broacher combined with a burnisher where the former is intended only to allow the latter to perform its function; and subclasses 33+ for a combined machine which broaches and performs another metal working operation.

83, Cutting, the generic residual class of cutting.

407, Cutters, for Shaping,

12, and 13+ for a broaching tool, per se.